Sawmill-dogging means



March 4, 1930. G. M. PELTON SAWMILL DOGGING MEANS l t e e h 4 5 t e e hs 2 Filed May 25, 1927 INVENTOR. 6. M P54 70y A TTORNE Y.

March 4, 1930.

G. M. PELTON SAWMILL DOGGING MEANS Z-Sheets-Shet 2 Filed May 25, 192'! ATTORNE Y.

Patented Mar. 4, 1930 r PATENT. orrics GEORGE M. PELTON, or MILWAUKEE,iscons n; Assren'on o THE :srtnn & STOWELL 00., OF MILWAU n-njwrsomvsm,A oonronarion or WISCONSIN SAWMILL-DOGGING MEANS.

Applicationfiled May 275., 1927". Serial No. 194,184.

This invention is directed to animprovementinmeans for limiting themovements of the dogs of a saw millcarriage to prevent the dogs; fromreaching the saw line without in any way interfering with the usuallimit travel; of the knee toward the saw line.

. I The invention is particularly applicable to that type of doggingmechanism in which'the dogs are adapted for either a minimum pro jeetionbeyond the face of the knee or amaxi:

mum projection beyond the face of the knee,

. theposition of-thedogs beinglmanually con trolled and adjusted at willto suit the parti-- cularconditions of dog use; Obviously,where 5 thedogs arecapable of minimum or maximum projection beyond the face of theknee, anymeans to limit the movement of the dogs toward the saw line tothereby prevent the dogs from entering the sawline must take 2 intoconsideration the dilferent relative positions ofthe dogs relativetothe'face of the knce,,f0r=if the knee was interrupted in its traveltoward the saw line so as to prevent the dogs at their minimumprojection from oeing engaged by the saw, obviously the dogs whenprojected to their maximum degree 1 Would reach the saw line before theforward movement of the knee was completely interrupted. Conversely, ifthe knee interruption so was provided for to take care of the dogs whenprojected their maximum distance beyond the 'face ofthe knee, theknee'travel would be stoppedlong before the dogs when at their I m nimumprojection could. enter the saw line.

Thus, no'positive stop cooperatingwith the V knee alone can properlytakecare ofboth con- ,"di Q S- H r 'Qf r the d g a d th he op r ting 7means of the type to which this invention is I directed have beenmounted on the outsideof,

the knee, but it has been found desirable to so construct the parts asto mount theessen tial dog operating elements and thedogs within theknee, T his arrangement has brought yabout the necessity of providingimproved I means adapted for cooperation with the" housed dogs,toliinit; their movementitoward" the saw when; in: either theirmakimumyori.

minimum positionr 59 Therefore, it. is the primary objectof the presentinvention to provide a stop for the movement of the dogs toward the sawline, Which stop, when in operation, interrupts the movements of thedogs toward the saw line and holds the points of the dogs fixed orstationary without interrupting the movementof the knee. The kneeunderthis construction will continue to move forward to its normal limitstop while the dogs, being interrupted by the stop of this invention,will be proportionally withdrawn back into the knee asthe knee advances.1

The invention is illustrated in the accompanying drawings, in which:

Figure 1 is a view in side elevation showing the knee provided with theimproved adjustable limit means.

Figure 2 is a perspective view showing the limit means connected to theguide rod for the unit support and adjustment of the dogs.

Figure 3 is a View in front elevation of the knee equipped with thelimit means.

Figure l is a similar view showing a slight i modification.

'The improved dog limiting means is designed particularly for use inthat type of dogging mechanism wherein one or more dog units are mountedupon a guide bar 1 which {is adjustable with respect to the face of the,kneejto thereby cause the operating pointsof in the side of the knee,such shafts being provided at their outer ends with rigid arms 5connectedfor's multaneous and similar move.-

ment; throu h a bar 6. One of the arms 5 as the upper one, is connectedtothe piston rod 8 of a piston operative in a cylinder 9 andconstituting a motor mechanism to be suitably controlledby the admissionof apres:

i is

sure medium to turn the cranks 2 on their pivotal supports and therebymove the bar 1 and the dog units toward and from the face of the knee toprovide for minimum or maxi IHUJII face of'the knee. c n v In theformillustrated in Figures 1, 2 and 3,'the arms 5arepivotally'supported onthe knee and the cranks 2 are connected to the bar 1 by crank pins 10operating through an arcuate slot 11 in the side of the knee to permitthe play of the lower pin 10 in the: ad justment of the guide bar. V Y

The stop mechanism includes an abutment or stop 12 mounted on the headblock in the path of movement of a hook orlug 13 at the free end ofa'bar 14, the opposite end of which is connectedat 15, to the outer endof lowercrank pin 10, outside of the knee. For

convenience, a portion of the bar 14 adjacent and including the hook orlug 13 is projected in parallelism with the planeof movement of theknee, the remaining length of the bar being inclined upwardly leading toits connection at 15. If desired and as preferred,

the straight portion of the bar 14 rests in a guide 16 carried on theknee toprevent displacement of thisbar while approaching and during itsengagement with the limiting stop 12. V In the form of the inventionshown i Figure 4, the lower crank 2 of the preferred form'is rigidlyconnected to the crank shaft 22 but its crank pin 23, which forms thepivotal connection with the guide bar 1, does not extend through theside of the casing. In lieu of the pivot pin formingthe conneca tion forthe bar 14, I mount a sleeve 24: onthe shaft 22, from which, outside ofthe knee, extends an arm or'lever 25 and at the outer end thereof isa'pivot pin 26 in alignment with the crank pin 23,. connecting the crank2 to the guide bar 1. To'the pivot pin 26 is pivotally connected the endof the bar 1 1;

' The operation of both forms is identical in so far as the dog limitingmeans is concerned.

. In this connection, attention is called to the fact that the usualhead block is provided with front stop 20 which isengaged by the kneestop- 21 'in the movement thereof and positively limits the knee in itsadvance toward the sawline to avoid interference with the'saw. 4

The present dog limiting meansoperates wholly independently of the kneestops and is without any effect on themovement of the knee in its usuallimit travel in eitherdirection. So far as the dog mechanism-is con-'cerned, it willbe understood that, through proper control of the motormechanism 9, the

guide bar 1 is adjusted so as to set the dogs for the maximum or minimumprojection beyond the face of the knee If this guide bar has beenadjusted for the minimum projec tion of the dogs, for example, it isapparentprojection of the dogs relative to the that should. theknee,inits movement toward 7 the saw line, move the dogs into the pathof the sawbefore the knee reached its forward limitstop, damage to thesaw and dangerto the operators would undoubtedly ensue.

WVith the guide bar 1 adj usted; for such mini mum dogprojection,however, it will be noted that bar 14 is correspondingly movedrearwardly with respect to the faceof'thc knee ZLIHlfO an extent inexactaccordance with the adjustment of the guide bar. Therefore, the hook orlug 13 of the bar 14 ismoved farther-from the face of the knee and hencethe knee is permitted a definite advance move- 7 ment toward the sawline beforethehook' or lug 13 engages the limit stop 12. If the guidebar 1 had been adjusted by the motor mechanism 9 to an advance position,thereby providing for the maximum projection of" the dogs, it isapparent that the bar 143 and hook 13 will be correspondingly advancedtoward the face of the knee in direct, accord- V ance' with the dogadjustment-and that, therefore, in the advance of the knee, the hook 18J would engage the stop 12 at ia definite point in the advance'of theknee,-'but, o'fcourse, at

a point farther removed from the's'aw line than where the dogs had beenprojected only .to'their minimum distance as in the instance abovenoted. As the knee advances, the hook 13 engages the stop 12 at theparticular pre determined position which isth'atposition at which thedogs, whether inadvanced, re-

tracted or intermediate position, have not yet reached the saw line.This engagement loo v.ofthe hook 13 and stop 12 arrests the for-, wardmovement of the guide bar with the knee, that is to say the guidesbarcannot ad- Vance with the knee while the latter is not interruptedbecause it "has not yet reached its own limit stop 'onthehead block. By

this arresting of the unit movement of the c guide bar and knee, thereis a relative movement produced betweenthese parts, that is the guidebar is held stationarytwhile the knee. continues to advance; This will,of

course,-

immediately effect awithdrawing operation of the dogs, that is the dogswill be gradually withdrawn into the knee as the knee continuesits'advance toward'the saw line,

Merely 'for' illustrative purposes," we will I assume that the knee stopon the'head block I interrupts the movement-of the knee while I the faceof the knee is one inch from the sawv of the face of the knee-,andthattheir maxivmum projection maybe anythingfrom three to five inches inaccordance-with theWork beinghandled. With the knee advancing thev logtoward the saw line and the dogs, say,

pr j cted four and cae halt in hesbeyond the face of the knee, therelation ofthe parts is suchthat the hook $13 will engage the stop 12when the free ends of the dogs are, say, one-quarter of an 1I1Cl1, fromthe saw line.

Obviously, the dogs cannot advance beyond this limit while the knee maycontinue to move to a position within one inch of the saw line. Afterthe movement of the dogs has been interrupted by the cooperation of thehook 13 and stop 12, and the knee continues to advance, the dogs aregradually retracted relative tothe face of the knee, that is the kneeadvances toward the free ends of the dogs, gradually reducing thedistance between the free ends of the dogs and the knee until, when theknee reaches its limit stop, the dogs Wlll have been withdrawn lnto theknee to leave the minimum. dog projection,

I three-quarters of an inch in the particular instance cited, and stillone-quarter of an inch from the saw line.- Thus, as the parts reachtheir minimum spacing from the saw,

whereinthe instance cited, the knee is stopped one nch from thesaw lineand the dogs are projected three-quarters of an inch beyond the face ofthe knee, it is apparent that there is no possible interference betweenthe dogs and saw.

The dog stopping mechanism of the present inventionis of course to beapplied on every knee and will be effective as the particular kneeadvances. It is of course apparent that with idle knees, that is thoseknees stop is of course equally as effective.

of the carriagewith which the log is not engaged, the idle dogs will begradually withdrawnvintotheknee asthe knee advances to thereby preventthe dogs from encroaching "those knees with which the log was engaged 7'5 aswell as where the dogs were idle, so that -'nismdisclosed in theapplication for patent V of G, E; Schnell, Serial No. 156,667, filed a,December 28, 1926, and make no claim broadfor the purpose oftheinvention, the stop is completely effective to prevent the dogs reachingthe saw line and this whether the particular dogs aresidle or engaged ina log.

, I am aware of the dog stopping mechaly to mechanism for preventingdogs movable to a maximum and minimum distance from the knee, contactingwith a saw, but

:rather to the particular character of the structure herein shown anddescr bed.

Theinvention; as applied toenclosed dogs tion as will insure of themovement of the dogs beinglimited to preventthem passing over the sawline. J

What I claim tobe new is:

- 1. In a sawmill Carriage, a knee thereof provided; with a slot andamounting for projecting. a dog at different distances beyond the face oftheknee including a crank arm pivotally connected: to the'mounting, ashaft mounted in the knee and on which the crank is mounted, the pivotof the crank and mounting extending through the slot, a rod mounted onthe pivot, said rod having a hook,

and a stop fixed with reference to the knee and with which the hookcontacts to prevent thed'og from reaching the saw line by limiting themovement of the dog toward the saw line.

2. In a saw mill carriage, a stop fixed with reference to the knee, aknee having a slot, a

dog mounting enclosed within the knee, a crank pivoted to the mounting,a shaft mounted in the knee and forming part of the crank, the pivot ofthe crank and mounting extending through the slot inthe knee, meansconnected to the pivot of the crank and provided'with a hook adapted tocooperate with the stop to prevent the dog from reaching the saw line bylimitingithe movement of the dog toward the! saw line. i

3. In a saw mill carriage, a knee, means for limiting the movement ofthe knee toward'the saw line, dogs'adjustable with respect to the faceof the knee to permit. the dogs to be projected to one of several distances, beyond they face of the knee, the min1'- mum distance of thedogs beyond the face of the knee being less than the distance betweenthe knee and saw line in the forward limit position of the knee, andmeans whereby the dogs when in other than their minimum projectedposition relative to the knee will be interrupted in unit movement withthe knee and held against further advance toward the saw line, theinterrupted movement of the dogs being at such predetermined point inthe movement of the knee'and dogs that at the limit movement of theknee, the dogs will be projected to their minimum distance beyond theface of the knee.

,4. In a saw mill carriage, a knee, a dog mounting having crankconnection with the knee, whereby the mounting may be moved toward andfrom the face of the knee, dogs carried by the mounting, a bar connectedto one of the cranks and extending lengthwise the knee, and a stop onthe carriage to be engaged by the bar in the movement of the knee towardthe saw line to thereby limit movement of the dogs. i l 5. In a saw millcarriage, a knee, a'dog mounting having crank connection with the knee,whereby to permit the mounting to be moved toward and from the face ofthe knee, dogs movable on the mounting, a stop on the carriage,andlmeansi connected to one of the cranks of the mounting and movablewith the knee to be engaged by the stop to limit further movement ofthedogs toward the saw line.

mg and knee to permit movement-of the mounting toward and fromzthe faceof the knee, dogs carried by the mounting, a stop on the carriage, andmeans movable with the cranks and adapted to engage said stop in themovement of'the knee toward the saw line to thereby limit furthermovement of the dogs 7 toward the saw. line.

7. In a saw mill carriage, alknee, a dog mounting, cranks connecting thedog mount ing and knee to permit movement of the mounting toward andfrom the face of the knee, dogs carried'by the mounting, a stop on thecarriage, and a bar movable with one of the cranks and having a hook toengage said stop in the movement of the knee toward the saw line. I

8. In a saw mill carriage, a knee, a dog mounting, cranks connecting thedog mounting and knee to permit movement of the mounting toward and fromthe faceof the knee,dogs carried byith'e mounting, a stop on thecarriage, and an extension from one of the cranks adapted to engage saidstop in the movement of the knee toward the saw line and thereby limitthe further movement of dogs toward the saw line without interferingWith the movement of the lmee.

In testimony whereof I afliX my signature.

. GEORGE M; PELTON.

6. Ina saw mill carriage, a knee, a dog mounting, cranks connecting thedog mount-

